Regulator valve



FIG. 1 is a top and rear perspective view of a regulator valve showing our new design;

FIG. 2 is a rear and top view thereof;

FIG. 3 is a right, rear and top view thereof;

FIG. 4 is a bottom and right view thereof; and,

FIG. 5 is a top, front and left view thereof.

The broken line showing of fasteners and surface structure is for illustrative purposes and forms no part of the claimed design. 

The ornamental design for a regulator valve, as shown and described. 